I have tweaked the link in the original reply so it works properly, it didn't before.
our underground group have been successfully repairing the fall for the last few weeks,right hand side had to be built back up with stone and mortar,left hand side was bowing so the same applys,take down and rebuild,anyone seen the awesome job we did last year on the re-arching and new keystone on sir francis level up gunnerside gill? really worth a look ;D